ringer vs role player

ringer and role player both are nouns.

Word	Noun	Adjective	Verb	Adverb
ringer	Yes	No	No	No
role player	Yes	No	No	No

As nouns, role player is a hypernym of ringer; that is, role player is a word with a broader meaning than ringer:

Other hypernyms of ringer include fake, faker, fraud, imposter, impostor, pretender, pseud, pseudo, sham, shammer.

ringer (noun)	role player (noun)
(horseshoes) the successful throw of a horseshoe or quoit so as to encircle a stake or peg	a theatrical performer
a contestant entered in a competition under false pretenses	a person who makes deceitful pretenses
a person who is almost identical to another
a person who rings church bells (as for summoning the congregation)